The present invention discloses a controlling device, a gimbal on which the controlling device is applied and a method for controlling a gimbal. The gimbal, for controlling an optical device to perform an action, may comprise a controlling device, a controlling assembly connected with the controlling device, and a performing assembly connected with the controlling assembly; wherein the controlling device may comprise a rocker for receiving an action instruction and generating a control instruction to be sent to the controlling assembly, the rocker may comprise a rocker handle and a potentiometer assembly connected with the rocker handle; the controlling assembly may be configured for generating a performing instruction for implementing a corresponding action according to the control instruction sent by the controlling device, and send the performing instruction to the performing assembly; the performing assembly may be configured for implementing a directional control for the optical device according to the performing instruction. The gimbal according to the present invention is easy to operate and has a good hand feeling, since the rocker is utilized to send the control instruction.